About: Cache stampede

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A cache stampede is a type of cascading failure that can occur when massively parallel computing systems with caching mechanisms come under very high load. This behaviour is sometimes also called dog-piling. To understand how cache stampedes occur, consider a web server that uses memcached to cache rendered pages for some period of time, to ease system load. Under particularly high load to a single URL, the system remains responsive as long as the resource remains cached, with requests being handled by accessing the cached copy. This minimizes the expensive rendering operation.

Attributes	Values
rdf:type	military conflict
rdfs:label	Cache stampede (en)
rdfs:comment	A cache stampede is a type of cascading failure that can occur when massively parallel computing systems with caching mechanisms come under very high load. This behaviour is sometimes also called dog-piling. To understand how cache stampedes occur, consider a web server that uses memcached to cache rendered pages for some period of time, to ease system load. Under particularly high load to a single URL, the system remains responsive as long as the resource remains cached, with requests being handled by accessing the cached copy. This minimizes the expensive rendering operation. (en)
dcterms:subject	Engineering failures Computer optimization Parallel computing Cache (computing)
Wikipage page ID	33896116 (xsd:integer)
Wikipage revision ID	1075757765 (xsd:integer)
Link from a Wikipage to another Wikipage	Memcached Engineering failures Concurrency (computer science) Parallel computing Web server Computer optimization Parallel computing Cache (computing) Cascading failure Caching (computing) Congestion collapse
Link from a Wikipage to an external page	https://www.adayinthelifeof.nl/2010/07/29/minimizing-cache-stampedes/ https://web.archive.org/web/20150612214633/http:/www.openswartz.com/2008/02/
sameAs	Cache stampede Cache stampede Cache stampede Cache stampede
dbp:wikiPageUsesTemplate	dbt:Mono dbt:Reflist dbt:Short_description
has abstract	A cache stampede is a type of cascading failure that can occur when massively parallel computing systems with caching mechanisms come under very high load. This behaviour is sometimes also called dog-piling. To understand how cache stampedes occur, consider a web server that uses memcached to cache rendered pages for some period of time, to ease system load. Under particularly high load to a single URL, the system remains responsive as long as the resource remains cached, with requests being handled by accessing the cached copy. This minimizes the expensive rendering operation. Under low load, cache misses result in a single recalculation of the rendering operation. The system will continue as before, with average load being kept very low because of the high cache hit rate. However, under very heavy load, when the cached version of that page expires, there may be sufficient concurrency in the server farm that multiple threads of execution will all attempt to render the content of that page simultaneously. Systematically, none of the concurrent servers know that the others are doing the same rendering at the same time. If sufficiently high load is present, this may by itself be enough to bring about congestion collapse of the system via exhausting shared resources. Congestion collapse results in preventing the page from ever being completely re-rendered and re-cached, as every attempt to do so times out. Thus, cache stampede reduces the cache hit rate to zero and keeps the system continuously in congestion collapse as it attempts to regenerate the resource for as long as the load remains very heavy. To give a concrete example, assume the page in consideration takes 3 seconds to render and we have a traffic of 10 requests per second. Then, when the cached page expires, we have 30 processes simultaneously recomputing the rendering of the page and updating the cache with the rendered page. (en)
gold:hypernym	Failure
prov:wasDerivedFrom	wikipedia-en:Cache_stampede?oldid=1075757765&ns=0
page length (characters) of wiki page	7958 (xsd:nonNegativeInteger)
foaf:isPrimaryTopicOf	wikipedia-en:Cache_stampede
is Link from a Wikipage to another Wikipage of	Cache (computing) Stampede (disambiguation) Distributed cache Thundering herd problem Dog-piling Cascading failure Cache miss stampede
is Wikipage redirect of	Dog-piling Cache miss stampede
is Wikipage disambiguates of	Stampede (disambiguation)
is foaf:primaryTopic of	wikipedia-en:Cache_stampede

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